Vow of the Undead (The Bloodrune Saga Book 1)

Sentenced to death for witchcraft, Silver is spared by a ruthless Viking king—only to be forced into marriage. With vampires lurking, gods hunting her, and two dangerous men vying for her, survival means choosing who to betray. A dark romantasy of forbidden desire, morally gray characters, toxic love triangles, and a steep cliffhanger.